Using light to control matter has captured the imagination of scientists for generations, as
there is an abundance of photons at our disposal. Yet delivering photons beyond the surface …

Conspectus Photon upconversion, the process of converting low-energy photons into high-
energy ones, has been widely applied for solar energy conversion, photoredox catalysis …

Triplet‐triplet annihilation upconversion (TTA‐UC) with near‐infrared (NIR) photosensitizers
is highly desirable for a variety of emerging applications. However, the development of NIR …

Photocatalysis is a fundamental and promising strategy for solar energy conversion.
Photocatalytic reactions are divided into three basic steps: light absorption, photogenerated …

Triplet–triplet annihilation photon upconversion (TTA-UC) is a process in which triplet
excitons combine to form emissive singlets and holds great promise in biological …

Many applications, including solar energy conversion, can be enhanced by the
upconversion of low energy photons. A flexible approach towards achieving this is by …

Photochemical upconversion is a process whereby two lower-energy photons are converted
into a higher-energy photon by sensitized triplet–triplet annihilation. While recent interest in …

Osmium (II) polypyridines are a well-known class of complexes with luminescent metal-to-
ligand charge-transfer (MLCT) excited states that are currently experiencing a revival due to …

Hybrid structures formed between organic molecules and inorganic quantum dots can
accomplish unique photophysical transformations by taking advantage of their disparate …

Several energy‐demanding photoreactions require harsh UV light from inefficient light
sources. The conversion of low‐energy visible light to high‐energy singlet states via triplet …